Trolley-harp.



No. 715,036. Patented Dec. 2. |902.

H. S.L DIWLR 'ERQLLEY" HARP.

(Agglcion med Aug. 15, 1902.1

(In Modal.)

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UNTTED STATES PATENT OFFICE.

HARRY S. DOYLE, OF S'I. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO JAMES C. DAVIS, OF ST. LOUIS, MISSOURI.

TROLLEY-HARP.

SPECIFICATION forming part of Letters Patent No. 715,036, dated December 2, 1902.

Application filed August 15, 1902.

To a/ZZ whom it may concern:

Be it known that I, HARRY S. DOYLE, a citizen ofthe United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Trolley- Harps, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, forming part of this speciiication, in which- Figure lis a side elevation, Fig. 2 is a front elevation, and Fig. 3 is a front View, partly in section, illustrating a modication.

My invention relates to improvements in trolley-harpe, my object being to provide a structure comprising but few parts which can be readily secured to the trolley-pole and serve to form efficient contact with the trolley.

To these ends and -also to improve generally upon devices of the character indicated my invention consists in the various matters hereinafter described and claimed.

Referring now more particularly to the drawings, l represents the trolley-pole, and 2 the trolley, these parts being of any usual or suitable construction. The trolley-harp comprises side arms 3, which have the axle for the wheel journaled in one end and are secured to the trolley-pole at their other end, said arms being of spring material, whereby they clamp the Wheel, (or the usual Washers 4. upon the sides of the same,) and thus make efficient cantact with said wheel. Preferably the arms are thinned at their outwardlycurved portions, as shown at 3a, in order to increase their resiliency. The arms are separated from each other at their ends adjacent the trolley-pole and are provided with means whereby they can be forced toward each other to increase the tension of the free ends of the arms against the wheel. I have here shown the arms as threaded, the threads extending along the parts of said arms which diverge Serial No. 119,736. (No model.)

from each otherso that the said threaded portion 5 tapers. A nut 6 is seated upon said threaded portion, and movement of said nut serves to adjust the tension upon the arms in a manner which will be apparent. This adjusting-nut can be locked in position in any suitable manner, as by means of a setscrew 7 and the jam-nut 8.

I prefer to form the harp of a single piece of material having solid arms, as shown in Figs. l and 2; but it will be apparent that without departing from the spirit of my invention the harp can be formed in two sections, as shown in Fig. 3, and the arms can be cut out in a well-known manner. When the harp is composed of a single piece of material, it has what may be termed a body portion 9, provided with a socket for receiving the trolley-pole, and the arms 3 diverge from said body portion.

I am aware that many minor changes in the construction, arrangement, and combination of the several parts of my device can be made and substituted for those herein shown and described without in the least departing from the nature and principle of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In a trolley-harp or the like, resilient arms having one end connected to the trolley-pole, said arms at said end being threaded and diverging from each other, an adjusting-nut .upon said threaded portions of said arms, and Va trolley journaled between said arms; substantially as described.

In testimony whereof I hereunto affix my signature, in the presence of two Witnesses Witnesses:

GALEs P. MOORE, GEORGE BAKEWELL. 

